Author(s): Victor Lee, Chi-Hsun Wu, Zong-Xing Lou, Wei-Li Lee, and Chih-Wei Chang
Measurements show that the thermal conductivity of carbon nanotubes diverges with length. At 1-mm, the nanotubes conduct heat approximately four times better than diamond or graphene.

[Phys. Rev. Lett. 118, 135901] Published Thu Mar 30, 2017